Which of the following molecules is synthesized from a steroid precursor and functions to modulate gene expression through binding to an intracellular receptor?
I. Testosterone
II. Triglycerides
III. Progesterone
IV. DNA
A. I only
B. I, II, and III
C. I and III
D. I, III, and IV
Click for Explanation
Common steroid-based molecules commonly seen on the MCAT include testosterone, progesterone, estrogen, cortisol, and aldosterone.
A) I only, incorrect.
B) I, II, and III, incorrect, Triglycerides consist of three fatty acids bound by ester linkages to a glycerol backbone.
C) I and III, correct.
D) I, III, and IV, incorrect, DNA is not a steroid-based molecule; DNA consists of deoxyribose, a phosphodiester linkage, and a nitrogenous base.
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